Inductance having a self-induction independent of temperature



M. osNo's Jul 24, 1934 INDUCTANGE HAVING A SELF INDUCTION INDEPENDENT OFTEMPERATURE Filed Sept. 9, 1932 INVENTOR MENDEL osuos' BY. fig IATTORNEY July 24, 1934- UNITED STATES mnucranca- HAVING a sm-nmuc'nonnvnnrnnnsnr or TEMPERATURE Mendel Osnos, Berlin, Ge

to Telerrnany, lu'nken Gesellschait tur Drahtlose Telegraphic m. b. IL,Berlin, Germany, a corporation of Germany Application September 9, 1932,Serial P30132418 M In Germany September 29, 1931 Claims. (Cl. 175-45)the glass tube so that it will fill up the interstices and gaps betweenthe glass and the copper con-' ductor. Since glass or fused quartz isnot subiected to any substantial amount or expansion, the length of theconductor between the terminals willnot be subjected to any increase inlength, whereas the mercury which is located inside the glass'tube andalmost fills the entirespace, will be free and able to expand orcontract between the interstices formed by the conductors 2 without anysubstantial value oi the inductance between the terminals being altered.In this manonlyuponthelengthoitheglasstubeandnot the copper conductor.

- Still better, another modification oi the above embodiment is theconstruction wherein the glass or quartz tube is filled (either byblowing or by auction) with copper dust or copper filing chips, I!

thetubeinordertofillupthespacesleitbetween the constituent copperparticles andthe latter and the glass walls.

In lieu of the copper filing chips mentioned above, relatively shortcopper conductors could be used with advantage which are arranged tofillup almost the whole space inside the tube, whereas the mercury wouldthen serve only as an electrical connection between the constituentconperecnductorst Abetterunderstandingoithisinventionwillbehadbyreierringtothedrawinsinwhich Pig. 1 shows an inductance 01 thisinvention in a developed iorm;

rlgdshowswflsubstantialivasingleturnoithe W I Arlmtshowsseveralturnsoitheimproved inductance coil of this invention.

Pig. 1 showsthisembodimentindeveloped iorm. ll ldenotestheglalorquartItiibe,2massiveor nor the current is in part caused toflow-throughv the copper and partly through the mercury so that thelength of the ensuing conductor depends and in addition mercury is drawnby suction into tubular copper conductors, 3 mercury, 4 the end Ielectrodes which dip into mercury. It will be seen that in this mannereach individual piece of copper is capable of contraction and expansionwithout occasioning an incidental change in the 00 over-all length ofthe inductance.

It the tube is to be bent circularly or annularly so as to provide acoil with a plurality of inductive turns, the copper rods or conductorsmust naturally be as short as possible in order to ren- 08 der themfreely mobile within the tube so that they may not experience anymechanical stress. However, since the spaces and gaps must be filled upwith mercury, and therefore as the latter has a far greater electricalresistance than copper,

this will result in an increase of aggregate loss resistance. In orderthat this resistance loss may be minimized, the tube of the modificationshown in Fig. 2 may be made of several parts 1', each one thereo!containing a freely mobile copper conductor 2, while the spaces betweenthe constituent conductors 2 are substantially filled up with mercury 3.

Various other modifications of coil constructions will suggestthemselves to those skilled in the art, such as a spiral coil or acylindrical shape of coil, which would be employed in a similar manneras mentioned above.

I claim; I 1. An inductance having a self-inductance which isindependent 01! temperature, comprising an insulating tube filled with aplurality of metallic conductors and the interstice between saidmetallic conductors being filled with a liquid conduc r. v i

2. An inductance having a sell-inductance which is independent ortemperature, comprising a quartz tube filled with a plurality oi smallcopper particles impregnated with mercury.

8. An inductance having a self-inductance 05 which is independent oftemperature, comprising a quartz tube filled with relatively shortcopper conductors inter-connected by mercury.

4. An inductance having a sell-inductance which is independent oftemperature. comprising an insulator tube filled with a plurality ofrectilinear metallic conductors with the spaces between said metallicconductors connected by mercury.

5. An inductance coll having a sell-inductance which is independent oftemperature, comprising an insulator tube filled with a' plurality ofmetallic conductors, the interstice between said metallic conductorsbeing filled with a liquid conductor. MENDEL 08808. no

